PM7375-SC datasheet(97/430 Pages) PMC

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PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

9.14.9 Receive Packet Descriptor Data Structure

The thirty-two byte Receive Packet Descriptor (RPD) Data Structure is used by the

LASAR-155 to describe a reassembled packet to the PCI Host. RPD's can be

linked together to form a linked list to accommodate large packets. The data

structure and the fields are described below:

9.14.9.1

Fig. 9.18 Receive Packet Descriptor

Reserved (16)

Res

Next RPD Pointer [13:0]

Status [10:0]

RVC [6:0]

Reserved (5)

Data Buffer Start Address [31:0]

Receive Buffer Size [15:0]

Bit 31

Bytes In Buffer [15:0]

CPAAL5_PDU CRC-32 [31:0]

CPAAL5_PDU Length [15:0] / Back RPD Pointer [13:0]

First RPD Pointer [13:0]

Res (2)

Reserved (9)

CPAAL5_PDU UU [7:0]

Reserved (16)

CPAAL5_PDU CPI [7:0]

Reserved (32)

Field

Description

The Chain End (CE) bit is used by the LASAR-155 to

indicate the end of a linked list of RPDs presented to the

PCI Host. When CE is set to logic 1, the current RPD is

the last RPD of a linked list of RPDs. When CE is set to

logic 0, the current RPD is not the last RPD of a linked

list. When the current RPD is not the last of the linked

list (CE=0), the Next RPD Pointer[13:0] field is valid;

otherwise the field is not valid.

Next RPD

Pointer [13:0]

The Next RPD Pointer is used to store RPDRs which

permits the LASAR-155 to support linked lists of RPDs.

As mentioned above, linked lists are terminated using

the CE bit. If CE is set to logic 1, this field is not valid.

Linked lists of RPDs are used by the LASAR-155 to

pass the PCI Host multiple RPD packets.

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